{"id":699170,"date":"2024-10-28T10:35:12","date_gmt":"2024-10-28T09:35:12","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=699170"},"modified":"2024-10-28T10:35:12","modified_gmt":"2024-10-28T09:35:12","slug":"tinh-dan-nhiet-cua-chat-long-nano","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/tinh-dan-nhiet-cua-chat-long-nano\/","title":{"rendered":"T\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a ch\u1ea5t l\u1ecfng nano"},"content":{"rendered":"

T\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a ch\u1ea5t l\u1ecfng nano nghi\u00ean c\u1ee9u c\u00e1ch th\u1ee9c v\u00e0 hi\u1ec7u qu\u1ea3 t\u0103ng c\u01b0\u1eddng truy\u1ec1n nhi\u1ec7t c\u1ee7a c\u00e1c h\u1ea1t nano trong ch\u1ea5t l\u1ecfng, t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t nhi\u1ec7t.<\/p>\n

\"T\u00ednh<\/p>\n

T\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a ch\u1ea5t l\u1ecfng nano<\/h2>\n

Ch\u1ea5t l\u1ecfng nano, hay c\u00f2n g\u1ecdi l\u00e0 nano-fluid, l\u00e0 m\u1ed9t lo\u1ea1i ch\u1ea5t l\u1ecfng \u0111\u1eb7c bi\u1ec7t \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh b\u1edfi vi\u1ec7c ph\u00e2n t\u00e1n c\u00e1c h\u1ea1t nano v\u00e0o trong ch\u1ea5t l\u1ecfng c\u01a1 b\u1ea3n (base fluid). C\u00e1c h\u1ea1t nano th\u01b0\u1eddng c\u00f3 k\u00edch th\u01b0\u1edbc t\u1eeb 1 \u0111\u1ebfn 100 nanomet v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u1ea3i thi\u1ec7n c\u00e1c t\u00ednh ch\u1ea5t v\u1eadt l\u00fd c\u1ee7a ch\u1ea5t l\u1ecfng n\u1ec1n, \u0111\u1eb7c bi\u1ec7t l\u00e0 t\u00ednh d\u1eabn nhi\u1ec7t.<\/p>\n

Vai tr\u00f2 c\u1ee7a t\u00ednh d\u1eabn nhi\u1ec7t<\/h2>\n

T\u00ednh d\u1eabn nhi\u1ec7t l\u00e0 kh\u1ea3 n\u0103ng d\u1eabn truy\u1ec1n nhi\u1ec7t \u0111\u1ed9 c\u1ee7a m\u1ed9t ch\u1ea5t. N\u00f3 \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p v\u00e0 k\u1ef9 thu\u1eadt nh\u01b0 l\u00e0m m\u00e1t \u0111\u1ed9ng c\u01a1, thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng trao \u0111\u1ed5i nhi\u1ec7t. Vi\u1ec7c c\u1ea3i thi\u1ec7n t\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a ch\u1ea5t l\u1ecfng c\u00f3 th\u1ec3 gi\u00fap t\u0103ng hi\u1ec7u su\u1ea5t v\u00e0 gi\u1ea3m chi ph\u00ed v\u1eadn h\u00e0nh c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng n\u00e0y.<\/p>\n

C\u01a1 ch\u1ebf t\u0103ng c\u01b0\u1eddng t\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a n\u1edbi l\u1ecfng nano<\/h2>\n

Trong m\u1ed9t s\u1ed1 nghi\u00ean c\u1ee9u, ng\u01b0\u1eddi ta nh\u1eadn th\u1ea5y r\u1eb1ng ch\u1ea5t l\u1ecfng nano c\u00f3 t\u00ednh d\u1eabn nhi\u1ec7t cao h\u01a1n so v\u1edbi ch\u1ea5t l\u1ecfng n\u1ec1n th\u00f4ng th\u01b0\u1eddng nh\u1edd v\u00e0o m\u1ed9t s\u1ed1 c\u01a1 ch\u1ebf:<\/p>\n

<\/p>\n

  • Truy\u1ec1n nhi\u1ec7t l\u1eabn nhau gi\u1eefa c\u00e1c h\u1ea1t nano:<\/b> C\u00e1c h\u1ea1t nano c\u00f3 b\u1ec1 m\u1eb7t l\u1edbn so v\u1edbi th\u1ec3 t\u00edch nh\u1ecf, t\u1ea1o ra s\u1ef1 truy\u1ec1n nhi\u1ec7t m\u1ea1nh m\u1ebd gi\u1eefa c\u00e1c h\u1ea1t v\u00e0 ch\u1ea5t l\u1ecfng n\u1ec1n.<\/li>\n
  • Hi\u1ec7u \u1ee9ng Brown:<\/b> Nh\u1eefng chuy\u1ec3n \u0111\u1ed9ng ng\u1eabu nhi\u00ean c\u1ee7a c\u00e1c h\u1ea1t nh\u1ecf trong ch\u1ea5t l\u1ecfng c\u0169ng g\u00f3p ph\u1ea7n t\u0103ng c\u01b0\u1eddng vi\u1ec7c trao \u0111\u1ed5i nhi\u1ec7t.<\/li>\n
  • T\u01b0\u01a1ng t\u00e1c li\u00ean k\u1ebft gi\u1eefa h\u1ea1t nano v\u00e0 ch\u1ea5t l\u1ecfng n\u1ec1n:<\/b> C\u00e1c li\u00ean k\u1ebft h\u00f3a h\u1ecdc ho\u1eb7c c\u01a1 h\u1ecdc gi\u1eefa h\u1ea1t v\u00e0 n\u1ec1n t\u0103ng c\u01b0\u1eddng \u0111\u01b0\u1eddng d\u1eabn nhi\u1ec7t.<\/li>\n

    <\/u1><\/p>\n

    \u1ee8ng d\u1ee5ng c\u1ee7a ch\u1ea5t l\u1ecfng nano trong k\u1ef9 thu\u1eadt nhi\u1ec7t<\/h2>\n

    Ch\u1ea5t l\u1ecfng nano \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau:<\/p>\n

    <\/p>\n

  • H\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t:<\/b> S\u1eed d\u1ee5ng ch\u1ea5t l\u1ecfng nano \u0111\u1ec3 l\u00e0m m\u00e1t \u0111\u1ed9ng c\u01a1, h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh, v\u00e0 thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed, gi\u00fap t\u0103ng hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a thi\u1ebft b\u1ecb.<\/li>\n
  • Trao \u0111\u1ed5i nhi\u1ec7t:<\/b> C\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 trao \u0111\u1ed5i nhi\u1ec7t trong c\u00e1c thi\u1ebft b\u1ecb trao \u0111\u1ed5i nhi\u1ec7t nh\u01b0 b\u00ecnh ng\u01b0ng, n\u1ed3i h\u01a1i.<\/li>\n
  • N\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi:<\/b> N\u00e2ng cao hi\u1ec7u su\u1ea5t thu nhi\u1ec7t v\u00e0 l\u01b0u tr\u1eef n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi th\u00f4ng qua c\u00e1c thi\u1ebft b\u1ecb h\u1ea5p th\u1ee5 nhi\u1ec7t.<\/li>\n

    <\/u1><\/p>\n

    T\u00f3m l\u1ea1i, t\u00ednh d\u1eabn nhi\u1ec7t v\u01b0\u1ee3t tr\u1ed9i c\u1ee7a ch\u1ea5t l\u1ecfng nano m\u1edf ra nhi\u1ec1u tri\u1ec3n v\u1ecdng m\u1edbi trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p v\u00e0 k\u1ef9 thu\u1eadt hi\u1ec7n \u0111\u1ea1i. S\u1ef1 nghi\u00ean c\u1ee9u v\u00e0 ph\u00e1t tri\u1ec3n li\u00ean t\u1ee5c trong l\u0129nh v\u1ef1c n\u00e0y s\u1ebd ti\u1ebfp t\u1ee5c mang l\u1ea1i nh\u1eefng c\u1ea3i ti\u1ebfn \u0111\u00e1ng k\u1ec3 v\u1ec1 m\u1eb7t hi\u1ec7u su\u1ea5t v\u00e0 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

    T\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a ch\u1ea5t l\u1ecfng nano nghi\u00ean c\u1ee9u c\u00e1ch th\u1ee9c v\u00e0 hi\u1ec7u qu\u1ea3 t\u0103ng c\u01b0\u1eddng truy\u1ec1n nhi\u1ec7t c\u1ee7a c\u00e1c h\u1ea1t nano trong ch\u1ea5t l\u1ecfng, t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t nhi\u1ec7t.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"\nT\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a ch\u1ea5t l\u1ecfng nano<\/title>\n<meta name=\"description\" content=\"T\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a ch\u1ea5t l\u1ecfng nano nghi\u00ean c\u1ee9u c\u00e1ch th\u1ee9c v\u00e0 hi\u1ec7u qu\u1ea3 t\u0103ng c\u01b0\u1eddng truy\u1ec1n nhi\u1ec7t c\u1ee7a c\u00e1c h\u1ea1t nano trong ch\u1ea5t l\u1ecfng, t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t nhi\u1ec7t.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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